Device and method for carrying out liquid-phase pre-lithiation treatment on silicon monoxide negative electrode material

Abstract

The invention discloses a device and a method for carrying out liquid-phase pre-lithiation treatment on a silicon monoxide negative electrode material. The device comprises a solvent kettle for dissolving a lithium source in an organic solvent, a mixing kettle for mixing the silicon monoxide negative electrode material and the lithium source, and a solvent recovery kettle for recovering the organic solvent, the device is used for carrying out liquid-phase pre-lithiation treatment on the silicon monoxide negative electrode material, so that the problem of potential safety hazards caused by volatilization of an organic solvent in the pretreatment process of a liquid-phase method can be effectively solved, the organic solvent can be recycled, the production cost can be remarkably reduced, and the device has good economic benefits and industrial application prospects. Besides, the selected organic solvent is a high-boiling-point inert solvent which does not react with the lithium metal, so that the lithium metal keeps zero valence and has strong reducibility, and the high-boiling-point inert solvent only plays a role in heat conduction and lithium metal dispersion, so that the lithium metal is molten and dispersed into fine particles in the solvent and can fully react with the silicon monoxide negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a device and a method for performing liquid-phase pre-lithiation treatment on a silicon oxide negative electrode material. Background technique [0002] Traditional graphite anodes can no longer meet the needs of higher energy density in cell design. Si oxide anodes have high specific capacity and are considered to be the most promising new-generation anode materials, but they also have some defects and cannot be applied on a large scale. . When lithium is inserted into the silicon oxide negative electrode, the expansion reaches 200%, and the material is easily pulverized and fails during the cycle. When lithium is inserted for the first time, a large amount of irreversible lithium silicate is formed, resulting in a low first effect and poor conductivity of the material itself. [0003] In order to improve the first Coulomb efficiency, it can be pre-lit...

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Problems solved by technology

[0005] The object of the present invention is to provide a device and method for liquid-phase pre-lithiation treatment of silicon oxide negative electrode materials, so as to solve the problem of reducing lithium reducibility in the process of using liquid phase method to pre-treat silicon oxide materials in the prior art problems and potential safety hazards caused by the volatilization of organic solvents; at the same time, the device can provide a good oxygen-free and water-free environment to ensure the smooth progress of pre-lithiation treatment

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